Bekenstein and the Holographic Principle: Upper bounds for Entropy

Using the Bekenstein upper bound for the ratio of the entropy $S$ of any bounded system, with energy $E=M{c}^2$ and effective size $R$, to its energy $E$ i.e. $S\mathrm{/}E<2\pi kR\mathrm{/}\mathrm{\hslash }c$, we combine it with the holographic principle (HP) bound ('t Hooft and Susskind) which is $S\le \pi k{c}^3{R}^2\mathrm{/}\mathrm{\hslash }G$. We find that, if both bounds are identical, such bounded system is a black hole (BH). For a system that is not a BH the two upper bounds are different. The entropy of the system must obey the lowest bound. If the bounds are proportional, the result is the proportionality between the mass M of the system and its effective size $R$. When the constant of proportionality is $2G\mathrm{/}{c}^2$ the system in question is a BH, and the two bounds are identical. We analyze the case for a universe. Then the universe is a BH in the sense that its mass $M$ and its Hubble size $R\approx ct$, t the age of the universe, follow the Schwarzschild relation $2GM\mathrm{/}{c}^2=R$. Finally, for a BH, the Hawking and Unruh temperatures are the same. Applying this to a universe they define the quantum of mass $\sim {10}^{-66}g$ for our universe.